package kzy.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import kzy.common.BaseContext;
import kzy.common.R;
import kzy.dto.DishDto;
import kzy.entiy.Dish;
import kzy.entiy.ShoppingCart;
import kzy.service.DishService;
import kzy.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;
import java.util.List;

/**
 * @Author 大溪地
 * @create 2023年05月30日20:22
 * 购物车
 */
@RestController
@Slf4j
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

	@Autowired
	ShoppingCartService shoppingCartService;

	/**
	 * 添加到购物车
	 * @param request
	 * @param shoppingCart
	 * @return
	 */
	@PostMapping("/add")
	public R<ShoppingCart> addShoppingCart(HttpServletRequest request, @RequestBody ShoppingCart shoppingCart){
		log.info("购物车数据:{}",shoppingCart);
		//设置用户id，指定当前是哪个用户的购物车数据
		Long empId =(Long) request.getSession().getAttribute("employee");
		BaseContext.setCurrentId(empId);
		Long currentId = BaseContext.getCurrentId();
		shoppingCart.setUserId(currentId);
		Long dishId = shoppingCart.getDishId();
		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,currentId);
		if(dishId != null){
			//添加到购物车的是菜品
			queryWrapper.eq(ShoppingCart::getDishId,dishId);

		}else{
			//添加到购物车的是套餐
			queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
		}
		//查询当前菜品或者套餐是否在购物车中
		//SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
		ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
		if(cartServiceOne != null){
			//如果已经存在，就在原来数量基础上加一
			Integer number = cartServiceOne.getNumber();
			cartServiceOne.setNumber(number + 1);
			shoppingCartService.updateById(cartServiceOne);
		}else{
			//如果不存在，则添加到购物车，数量默认就是一
			shoppingCart.setNumber(1);
			shoppingCart.setCreateTime(LocalDateTime.now());
			shoppingCartService.save(shoppingCart);
			cartServiceOne = shoppingCart;
		}
		return R.success(cartServiceOne);
	}

	/**
	 * 获取购物车里面的物品
	 * @return
	 */
	@GetMapping("/list")
	public R<List<ShoppingCart>> getList(HttpServletRequest request){
		log.info("查看购物车...");
		Long empId =(Long) request.getSession().getAttribute("employee");
		BaseContext.setCurrentId(empId);

		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,empId);
		queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

		List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

		return R.success(list);
	}

	/**
	 * 清空购物车
	 * @return
	 */
	@DeleteMapping("/clean")
	public R<String> clean(){
		//SQL:delete from shopping_cart where user_id = ?

		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

		shoppingCartService.remove(queryWrapper);

		return R.success("清空购物车成功");
	}


	@PostMapping("/sub")
	public  R<String> sub(HttpServletRequest request ,@RequestBody ShoppingCart shoppingCart){
		Long dishId = shoppingCart.getDishId();
		Long empId =(Long) request.getSession().getAttribute("employee");
		BaseContext.setCurrentId(empId);
		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
		ShoppingCart shoppingCart1 = shoppingCartService.getOne(queryWrapper);
		shoppingCart1.setNumber(shoppingCart1.getNumber()-1);
		shoppingCartService.updateById(shoppingCart1);
		return R.success("修改成功");
	}
}
